I've released an app (click here) about a month ago now, and it works as it should on my Desire and presumably on a lot of other phones. However it is also receiving it's fair share of 1 star ratings with comments that say that the sound simply doesn't work. Given that this is an app to play sounds and alarms that's a pretty major problem. Thankfully one user emailed me to say it didn't work for her, so I at least know one model of phone it's not working on. However I have ZERO idea how you would even begin to work out why code isn't working on a particular phone. If the code is written right, and it works in the emulator and on my own phone, I can't begin to work out where to start fixing this. Any ideas?